Interpolation method for enlarging an image
an image and interpolation method technology, applied in the field of image interpolation method, can solve the problems of reducing image quality, image will become indistinct, and grating amount of operation is disadvantageous for hardware implementation, so as to reduce computation and reduce cost
Inactive Publication Date: 2007-03-08
TATUNG COMPANY
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Benefits of technology
[0005] The object of the present invention is to provide an interpolation method for enlarging an image, which uses a linear interpolation for obtaining interpolated pixel values so as to significantly reduce the amount of computation, thereby being advantageous to hardware implementation and reducing the cost.
Problems solved by technology
The image will become indistinct because of loss to the image information.
Moreover, this indistinct image reduces the quality of image.
Accordingly, such a grate amount of operation not only is disadvantageous for hardware implementation but also spends a lot of computation time.
Method used
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[0011] The present invention is an interpolation method for enlarging an image. The steps of the method are shown in FIG. 1. The method of the embodiment will be elaborated in FIG. 2 and FIG. 3.
[0012] With reference to FIG. 2, there is shown a schematic diagram of an image, wherein the image is composed of plural scanning lines 21. Each of the scanning lines 21 also includes plural pixels x1˜xn. Each of the pixels x1˜xn has a pixel value. When proceeding to enlarge the image, a microprocessor inserts the interpolated pixels among the pixels x1˜xn of each scanning line 21 for increasing the number of pixels of the image to achieve effect of enlargement.
[0013] Please refer to FIGS. 1 and 3. FIG. 1 shows a flowchart of interpolation method for enlarging an image in accordance with the present invention, and FIG. 3 shows a schematic diagram of the interpolation method for enlarging an image in accordance with the present invention. Firstly, it selects four adjacent continuous pixels x...
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The present invention relates to an interpolation method for enlarging an image, wherein the image is composed of plural scanning lines. Firstly, it selects four adjacent continuous pixels xk−1, xk, xk+1, and xk+2 which have the pixel values f(xk−1), f(xk), f(xk+1), and f(xk+2) respectively on each of the scanning lines; next, it determines three linear equations Lk−1, Lk, and Lk+1 according to every two adjacent pixel values f(xk−1) and f(xk), f(xk) and f(xk+1), and f(xk+1) and f(xk+2), respectively; then, it selects a pixel x to be interpolated between the pixel xk and the pixel xk+1; finally, it applies the pixel x to the three linear equations Lk−1, Lk, and Lk+1 to determine three candidate pixel values which are weighted and combined to obtain pixel value f(x) of the pixel x.
Description
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an image interpolation method and, more particularly, to an interpolation method for enlarging an image. [0003] 2. Description of Related Art [0004] In an image process to enlarge an image, the image of low-pixel has to be enlarged as an image of high-pixel. The image will become indistinct because of loss to the image information. Moreover, this indistinct image reduces the quality of image. In order to avoid this problem, when the image is proceeding to enlarge, a microprocessor uses an interpolation method, such as B-spline or Bicubic, for interpolating pixels to the image to be enlarged, so as to obtain new pixel values to achieve good vision quality. However, the interpolation operation uses a complex cubic polynomial for calculating interpolated pixels. Thus, when proceeding to enlarge for the image, lots of multipliers and adders are required to implement the interpolation ope...
Claims
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Login to View More IPC IPC(8): G06K15/02
CPCG06T3/4007
Inventor CHOU, CHUN-HSIENLIN, JEN-CHIEHLIAU, SHU-MINLEE, TSUNG-HAO
Owner TATUNG COMPANY